The admin center must pass relax=true when needed

When a non compliant package is installed from the admin center, no relax parameter is currently passed to nuxeoctl.
Since NXP-16311, the auto relax=true has been removed.
So, the package install fails: ERROR [org.nuxeo.launcher.connect.ConnectBroker] org.nuxeo.connect.update.PackageException: Package nuxeo-dam not available on platform version cap-7.2-I20150123_0122 (relax is not allowed)

Auto relax = true could be allowed on pending actions if the package version is specified or we can add a relax=true option in the pending actions which would be explicitly set by the admin center when it request a non compliant install.